Attachment for lisk grinders.



F. N. L F. E. GARDNER. ATTACHMENT Fon msx MINDERS.

APPLICATION YILED JULY 26,1910. LQQLH n Patented Aug. 29, 1911.

2 SHEBTSSHBET 1.

P. N. @L P. E. GARDNER. ATTACHMENT POR DISK GRINDBRS.

APPLITN FILED JULYZ, 1910. :l @3511 Patented Aug. 29, 1911 2 SHEETS-SHEET 2.

lllllll Sllt'ld PATENT (lflilillltlll.

FREDERICK N. GARDNER ANI) FREDERIC E. GARDNER, 0F BILLOI'I,l WISCONSIN', ASSIGN- ORS 0F ONE-THIRD TO LOUIS WALDO THOMPSON, 0F BELOIT, WISCONSIN. i

ATTACHMENT FOR IISK GRINDERS.

Speclcaton of Letters Patent. Patente-1 Aun Application 'tiled July 556, 1910.

Serial No. 573,826:

To all whom it may concern:

Be it known that we, FREDERICK N. GARD- Nnn and Fimnaaic E. GARDNER, citizens 0f the United States, residing at Beloit, in the county o Rock and State ot' VV'iseOnsin, have .invented certain new and useful Improvements in Attachments for .Disk Grinders, of which the following is a specification.

This invention contemplates an attachment for disk grinding machines of the type disclosed in our prior application Serial No. 528,791, filed November 18, 1909. The machine shown in said application is especially adapted for grinding or surfacing wood, and is particularly intended for use by pattern makers.

The object of this invention is toprovide an attachment for disk grinding machines adapted to facilitate the grinding of plane faces at the exact angle desired.

In the accompanying drawings, lligure 1 is a fragmental side elevation of a disk grinding machine having an attachment thereon Aembodying the features of our in vention. Fig. 2 is a plan view of the attachment and a portion otl the machine..`

Fig. 3 is a view similar to Fig. 2 but showing the attachment in a diil'erent position. Fig. t is a side elevation and Fig. 5 is a central sectional viewof the attachment.

The machine illustrated in Fig. 1 cornprises a suitable base 1 having bearings 2 thereon in which is mounted a shaft 3 earrying a drive pulley Lt. Fixed on one end of the shaft 3 is a disk 5, to the orter face oE which is secured a sheet of sand paper or other abrasive material. A segment 6 having a groove 7 therein iixed to a ineiner 8 which is .ertically slidable upon the base 1. Said member is attached to one end of a cable 9 passing over a sheave 10, the other end of said cable carrying a counterbalaneing Weight (not shown). The work table It] is carried by a segment .l2 having a curved rib on its inner tace which travels in the groove 7 in the segment The segments o `and 1Q are secured together by means of bolts 13 passing tlirough the segment (i and through arcuate slots 14 in the segment 12, said bolts having nuts 15 turned thereon.

lt will be seen that the'work table 11 may face of the disk 5 and coincides with the innermost portion of the beveled edge of l the table 11. The movement of the segment a rotative one, and the axis of rotation being coincident with the inner upper edge ot the work table, it will be seen ythat the work table may be tilted without changing the position of the inner edge lthereof. To clamp the table in the desired `position one of the nuts l5 may be turned up tightly by means of a. handle 1G formed thereon.

The embodiment of our invention which We have herein shown comprises a bar 17 "adapted to slide in a groove 18 in the face Al of the work table 1l. said lparallel with the face ol the disk 5.

groove extending Positioned upon the bar .17 is a body portion 19 which may be hollow, as shown in Fig. 5, for thesake of lightness and also to make Vit yielding or conipressible for a purpose to be later described. Extending upwardly through the bar 17 and through an opening 20 in onewdl 19 of the body 19 is a stud 21, the headQll of said stud being countersunk in the lower 4.face of the bar 17. A nut 22 is threaded on the Lipper end of the stud 21, said nut bearing against the body 19 and having a handle 23 preferably formed integral therewith. lll/'hen the nut Q2 is turned down tightly, the body portion is locked against rotation. The body 19 has a protractor 19" thereon, 'said.,protract0r in this instance being formed integral with the body.

A gage rail 211 is mounted in the body 19 to slide longitudinally, said rail having a rib 25 thereon which is dovetailed in a groove Q9 in said body. A horizontal slot 27 is cut through the wall 19 ot the body adjacent the groove 26, to permit the upper and lower portions of said wall 19 to yield toward each other so. as to clamp the rail 24 in its groove 26.

be clamped against'rotation upon the bar 17, by the single operation of turning the nut 22 downwardly on the stud 21. This feature is valuable in the saving of time.

A zero line 2S may be formed on the bar 17 to coperate with )the protractor 19h.

The opposite ends4 ai the rail 24 are beveled as shown, so thatit-he rail may be adjusted close to the grinding disk 5 atl any angle of said rail.

It will be seen that the attachment may be used either rightor left-handed. Referring to Fig. 3, the body 19 and rail 24; may be rotated from the position there shown to present the opposite end'of the rail toward the grinding disk. This has been found very convenient in practice. The locking means, beingcoaxial with the axis of rotation of the body, offers no hindrance to such turning ot' the body as is necessary to'place line 28, so that when the gagev rail is reeither end of the gage rail adjacent to vthe disk. The axis of turning movement is intermediate the two end portions of the zero versed the protractor is still in operative relation with t-he Zero-indicating means.

` In the use of the attachment, the protractor 19h is adjusted with reference to the zero line at 28 'to set the rail 2a at tho desired angle to the grinding disk 5, and said rail.

The bar 17 is slidable in its groove 18v over the entire face of the disk A5. This is important since it permits of utilizing the entire grinding'surface of the disk. If the cutting is confined to one space on the grinding disk, llie alnading material at this space i becomes filled with the fine wood dus-t, thus materially reilucing its cutting action.

By tilting the work table l1 upwardly or. downwardly, eon'ipound angles of any desired degree may beground.

lfVe claim as our invention:

l. In a disk grinding machine, the combination of a rotary grinding disk, a work `table supported adjacent to said disk, an u right stud on said table, a body-rotatab y mounted on said stud, a gage rail slidably mounted 'in said body, and means coperating with said stud for clamping said gage rail against sliding movement and locking said body against rotation.

25111 a disk grinding machine, the 'combinationof a rotary grinding disk; a Work table supported adjacent to said disk; a

body rotatably mounted onsaid table; a

gage rail slidably carried by said body; and a single means for locking said. body against rotation and for locking said rail against sliding movement.

3. In a disk grinding machine, the combination ofla rotary grinding disk; a Work table supported adjacent to said disk; a

4ibody rotatably mounted on said table, a

gage rail slidably mounted in said bodyby means of a rib and groove connection, said body1 being eompressible; and means for compressing said body to clampv the rib between opposite walls of the groove and thus lock said gage rail against sliding movement.

4. In a disk grinding machine, the combination of a-rotary grinding disk; a Work table supported adjacent to said disk, said table having a groove therein parallel with vsaid disk; a bar slidable in .raid groove; a body rotatably mounted on said bar and '.a horizontal slot extending inwardly from said groove and intersecting said stud; a gage rail having 'a dovetail rib slidably mounted in said groove; and a nut threaded on the upper end of said stud, said nut being adapted to clamp'said rail against sliding movement and lock said body against rotation.

6. In a disk grinding machine, the combination of a rotaryg'rinding disk; a Workt'able supported adjacent to said disk, said table having a groove extending parallel with the, face of said disk; a bar slidable in said groove; a body attached to said bar,l said body having a groove of non-circular cross-section; and a gage rail having a rib corresponding in cross-sectional form to the form of the groove in the bodyand slid-l ably iitting within said last-v mentioned groove, whereby the. gage rail is non-rota.- tably and slidably connected to the body.

7. In a disk grinding bination of a rotary grindingdisk; a worktable supported adjacent to said disk; a member -mounted to slide on s aidy table in a'direction parallel with the face of the disk, said member having a zerol line thereon; a body provided uponv one side with a i protractor; a gage rall connected to the other side of the body for siiding move ment 'toward and away from the disk, seid body beingpivoted :1t :t point between the pxotraotor and the gage rail and between the ends ot' snid zero line, whereby the body may be turned to bring the protraetor into operative relation with either end portion of said line, and means coaxial with the axis of rotation of the body for locking it against rotation.

FREDERICK N. GARDNER. FREDERIC E. GARDNER.

Witnesses:

H. WV. Anmfs, CARRIE HIGKSON. 

